It is a culture type building that has 2 to 5 benefits.
Pop/culture was mentioned.
Weeping Willows (mana and culture), Woodelves Habitat (pop, mana and culture), Moonstone Library (pop, scrolls, spell fragments, culture), Magical Nutcracker (various, culture), Witches' Hut (pop, Frogs, Orcs, culture), Frozen Owl Cave (pop, tier2, culture), Phoenix Chick, are some examples.